Improvement in machines for forming carriage-springs



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`Letters Patent No. 113,164, dated March 28, 1871; antcdated March 20, 1871.

IMPROVEMENT IN MACHIES FOR FORMING vCARRIAGEv-SPRINGS.

The Schedule referred to in these Letters Patent and making part of the same.

clare the following, when taken in connection with the'accompanying drawings and the letters of refer-` ence marked thereon, to be a full, clear, and exact description of the same, and which said drawings coustitute part of this specification, and represent in^ Figure 1, a front view;

Figure 2, a sectional view; and

Figure 3, a section through oneof the rolls.

This invention' relates to an improvement in apparatus for forming carriage-springs and It consists in the arrangement hereafter described, by means of which a combined rotating and reciprocating movement is imparted to the rolls.v

A is the frame, which supports the operative mechanism.

B and B are two cam-shaped rolls, one right hand Ianbd the other left, fixed respectively to their shafts The bearing of the said shafts is arranged in slides a, working between guidesC C, (see lig. 3,) so that the shafts may be moved toward or from each other as may be required.

D D are two heads, arranged upon a bed, E, and so as to travel toward or from each other by means of athreaded shaft, d, (may be one to each head, or a single shaft extending through both, with a right-and left thread,) so that, by turning the said shaft, the two heads may be-drawn vasunder or be made to approach each'other.-

The bed E is arranged so as to move vertically up `and down in suitable guidewayspn the frame, and

may be drawn down by a treadle, Rand up 'by a weight, W, as seen in Iig. 3.v

On each` of the shafts of the respective rolls is arranged a pinion, H, (see figs. 2 and 3,) and in connecV` tion therewith are arranged two equally-inclined racks, I, with a vertical rack, L, attached thereto.

The said racks vI have a bearing, f,'upon the carriages which support the shaft b, so that, 'as the racks are drawn down from the position in g. 2 to that denoted in broken lines in same gnre, the shafts b b receive a rotary motion from the teeth ofthe racks working in the pinions H, and at the same time are caused to advance toward each other by the connection or bearing f, on the said racks,'and the return of the racks in Vlike manner forces the shafts asunder, thus imparting 'to the shafts acombined reciprocating' and rotary movement.

The necessary movement is given to the racks by means of the pinion N,' working in the vertical rack, as seen in g. 2.

The form upon which the spring is rolled consists of a steel or iron plate, n, resting on the heads D D, and upon a central stud, P, which has a front or pin t extending through the center of the fo'rm. y

rIhe rolls being'brought together, as denoted in broken lines, iig. l, the spring is heated and placed between the rolls and former n, (the bed E being ldepressed to allow the introduction of the spriugg) then the rolls bearing hard upon the spring are caused to revolve, and at the same time travel toward the end, binding the spring down into form-in the most perfect manner.

To insure the straightening of the spring laterally I form a flange or edge, s, on each side of the roll, the face of the roll being the width of the spring, so that the spring, set at first between the flanges of the roll, will be guided therein to the `extreme end, and thus insure notouly the proper curvature, but

v perfectly straight edges.

.The former n is used for making the first leaf or back of the spring.

When this first leaf has been formedv 'it is taken from the machine and tempered, then the former n is taken out and the back leaf inserted, which serves to form the next leaf, and so on, each successive leaf serving as the former for the next, the two heads D being drawn together as the leaves shorten.

If preferred, the Yleaves may remain until all are c formed.

I do not wish tol be understood as broadly claiming the arrangement of a pair of rolls to operate in combination with the former to bendthe springs, as such is not new.

I claim as my invention- In combinatiom, with the .verticalrack L and its pinion N, the inclined racks I, with their respective pinions H arranged Vin bearings connected to said inclinedv racks, so that, by means .of the said racks I, both a reciprocating and rotary movement is imparted to the pinions H.

WM. HARTY,

Witnesses:

JOHN H. SHUMWAY A. J. Trnrrs. 

